Gidday I'm new to KTM and have brought a 2007 125sx. Everything seems to be o.k other than when the bike is going there seems to be a lot of smoke from the exhaust. The inside of the baffle seems wet with oil also. The guy before me ran 40:1 ration with motorex.
Is this normal or is there something I should be concerned about?
Thanks - Noss ;-)

G'Day Bajadog, Thanks for the reply - I am going to find out more on the fuel mixture specs and mil's oil per liter of fuel for optimal performance and engine longevity. I brought Motul Off Road 800 - Ester 2T for oil mix and Shell Advance Ultra 2 for the box. All new to these 2 strokers. ;-) Thanks again pal

The oil seal between crank and gearbox may have let go. That can also result in excessive smoke. At 40:1 even if jetted rich smoke should fall off as revs rise. Time for a strip down. Could also be power valve issue .good luck

Yeah MeanKilleen thanks for the reply, With the125sx it's smokey when idling but as the revs increase it does fade away. This is my first 2 stroke other than this they have 4's. It sounds normal then if it goes away on higher revs that's good news for me i guess. thanks for the reply mate - Cheers Chris

2 strokes in general like to be ridden hard, on the pipe, especially 125's. Most people who know how to ride 125's, jet them to be ridden mostly on the main jet. However, if your riding on the line between pilot and main, mostly using the needle, yes it will be more smoky because you'll be loading it up and not letting it burn off the excess oil.

Oil ratio, jetting and rider ability all go hand-in hand. A ratio/jetting for one person may not work for another, just because of their riding habits/style. So too much spooge/oil burning off can mean a lot of things, jetting of course being one of them.

If you can stay on the main jet (throttle pinned) everywhere, you most likely won't have any issues. I have yet to own a 125 that hasn't been a smoker when at idle or low RPM's, so you may be OK.